You're not hearing me. Start round. Blink. Dead. As in dead <1 sec from round start. You know where the team starts the round, all on one pile? Thats where the toob hits. Hence 5-6 kills with a single tube.
Nades only start arriving >5 seconds into the round (5 sec fuse

). Because they have less forward momentum they A) fly slower B) need a higher trajectory C) don't have the range to hit the opposing round start point without both teams running towards each in the first few seconds.
With a tube used as described you've got <1 second, which isn't enough to clear the tube AoE. i.e. There is *nothing* you can do to prevent dying.
uhmm wtf dude?